My T has an office number he gives to everyone. It is an answering machine. If you leave a message, he is really, really bad about calling back. I don't think he checks his voicemail every day. I don't like to use this number because if I leave a message and he doesn't call, I feel ignored, abandoned, and vulnerable.
I almost never call my T.
I got his cell phone number because he has called me from his cell so I captured the number and saved it to my contacts list. One time, T told me to call him at a certain time (it was a desperate sort of thing) and his office voicemail was full, so I used his cell phone number, which he had never officially given me. I was worried about that, but he was fine with it and since then has told me a couple of times to call him on his cell.
I do not have his home number.
My lawyer gave me her office, cell, and home phone.
She's great!